Engine head removing tool



Feb. 1, 1944.

A. KERzAK ENGINE HEAD REMOVING TOOL Filed bec. Y 11 1942 HND/#E w frfnznk,

IN V EN TOR Patented Feb. l, 1944 g UNITED STATES PATENTv OFFICE ENGINE HEAD REMOVING TOOL Andrew Kerzak, Bronx, N. Y. v

Application December 1l, 1942, Serial No. 468,639 l 2 Claims.

This invention concerns a tool for removing an engine head from an engine body or block.

The abutting surfaces of an engine head and of an engine body, aside from being drawn into tight abutment by bolts and nuts, are usually sealed by gaskets, pastes, and liquids, or combinations thereof, which are to provide a tight bond.

In addition these faces are exposed to heat, and ordinarily parts of the cooling jacket open therethrough forpassage of water, so that rust and corrosion set in, all of which serve to eiect or to enhance a tight freezing of the engine head onto the engine body. Such a bond oiers obstacles in the removal of the engine head from the engine body, and quite often an engine is harmed and impaired by the rough treatment necessary to pry and lift the engine head off the engine body. For that reason tools have been developedrwhich are to facilitate the removalv of an engine head. They are designed upon the principle of prying or pulling the engine head loose from the engine body. On the other hand it is known that bonding materials and the abutting metals, more particularly when they have been dried and oxidized by heat and again corroded by the iniiux of water and the acids of the exhaust gases, cannot be pulled apart, but that the sticking surfaces part much easier if the bond is loosened and broken by tapping and knocking and then the head is pulled olf.

A tool facilitating the removal of an engine head from an engine body, in the said fashion, is the principal object of the instant invention.

Other objects of this invention will be learned from the following description thereof, which is given by way of two specific embodiments. Details of those embodiments are however rendered herein for purposes of illustration only, and not in limitation of the invention.

In the drawing:

Fig. 1 shows a partly cross-sectioned elevation of a tool of this invention, as applied for the removal of an engine head, the engine head having just been liftedoi the engine body.

Figs. 2 and 3 show a bisected top view and a partly sectioned elevation, respectively, of a modied embodiment of this invention.

Similar numerals refer to similar parts throughout the various views.

Fig. 1 shows the engine head'or top 5 to be retained by bolt I in a slightly raised positign above the engine body or block 4. The cooling water manifold 5 of the head 5 customarily coin-` municates with the jacket of the engine body! faces 1 thehead and body are in sealed abut-r ment when assembled.

An engine head is normally provided with aV plurality of tapped holes serving for connection to the inside of the engine, some of those tapped holes overlying solid top surfaces of the engine body 4. Fig. 1 shows an adaptor 9 to be provided with the threaded shank I0 and to be secured thereby in such a tapped hole I I of the engine head 5, that tapped hole serving normally, for instance, to receive a spark plug. If a device for this invention is however to be applied to differently tapped holes, or to the differently tapped spark plug openings of the engine head -of another type of an engine, another threaded shank I2 may extend in the opposite direction on adaptor I3, such shank I2 iitting such a ydifferently tapped hole, and the adaptor I3 being used in that case in an upside down position.

A polygonal shoulder I3 facilitates engagement "of the adaptor I5 by a wrench for purposes of seating it tightly in such a tapped hole in an engine head. f

A thread extends throughj the bore of the adaptor I3 and accommodates the threaded portion I4 of a bolt I5. Bolt I5 has been rotated by manipulation of the arms or handle bars I1 which xedly extend from a knob I8 formed on the bolt I5. One or more bolts I5 have thus lifted the engine head 5 into the raised position shown,

the tip I6 at the bottom of bolt I5 resting in reaction upon a top surface of the engine body 4.

Bolt l5 has a head I9 at its upper end, which is shown to be removably attached by being screwed onto the threaded upper end 20 of bolt I5 in order to permit the weight 2I to be slipped onto the bolt I 5.

Weight 2| is shaped for handling a toroidal surface 22 being indicated for such purpose.

When one or more tools of the type lust described are applied to an engine head for purposes of its removal from the engine body, the bolts I5 are rst raised, i. e. threaded up in the respective adaptors I3. Thus these adaptors can be inserted in the engine head 5 and secured therein, before the tip I6 of the bolt I5 touches the engine body 4. The weight 2| will of course not be in the raised position shown in the drawing, but Will rest upon the knob I8 of the handle; these parts may then be engaged by the hands of the operator and he may jerk or throw the weight'up against the head I9 on bolt I5 in a tapping or knocking operation, which serves to break the bond at the sealed, abutting surfaces 'I of the engine head 5 in engine body 4. Such tapping or knocking may be repeated after the operator has screwed the bolt I down by manipulation of handle I'I and the engine head is thereby placed under tension relatively the engine body 4, as the tip I6 of bolt I5 starts to rotate in abutment upon the top of engine head 4. If the seal is still not-broken the engine head does not readily lift oil the. engine body, weightl 2I may again be used for tapping or knocking operation,

being forced up or down and yielding blows*l against the head I9 or the knob I 8, lwhich are After the engine head has then been lifted off the engine body 4 by further rotation'of the bolts, the tools may be removed by unthreading the adaptors I3.

The device of this invention vmay be simplified and the weight of the handle portion may be effectively added tol that of the weight 2I if the handle bars or armsV I1 are directly applied to the weight, and the weightA is rendered non-rotatable though it remains reciprocatable on the bolt, e. g.y by a feather-key engaging it upon boltsaIS. A modification embodying this principle is indicated in Figs. 2 and 3.

Ina device of Figs. 2 and 3 the manipulating means, e. g. bars or arms I'I, extend radially out from the upper end ofthe weight'SD. By means of a square hole weight 30 reciprocatably ts the square shoulder 3| extending between the xed' head 32 and the acme thread 33 of the shoulder screw 34 of that embodiment. Acme thread 33 engages inl thecorrespondingly tapped hole of an-adaptor 35. 1

The outside diameter of acme thread 33 is substantially the same or less than the width across flats ofthe shoulder 3| so that the weight 3l!Y may be slide ontothe screw. 34 froml the bottom end thereof before the screw is threaded into an adaptor 35.

A device of Figs. 2 and 3 is applied to and re-' moved from an engine head in exactly the manner hereabove described in connection with the embodiment of Fig. 1. During the operation of removing the engine head from the engine body the element I3 may be used alternatively or simultaneously for knocking or tapping as well as for pulling the engine head from the engine body by screw action.

Having thus described my invention in detail, yet I do not wish to be limited thereby, except as the state of the art and the appended claims may requireffor it is obvious that various modications and changes may, bemade ,in the form of embodiment of my invention, without departing from the spirit and scope thereof.

What I lclaim is: Y -1. A tool for removing an engine head from thefenginebody comprising a screw, a, head on one end of said screw, an adaptor to be mounted inv an opening of an engine head and threadedly accommodating the other end of said screw so that said screw may be turned in reaction against an. engine body underlying the engine head on which fsaid adaptor is mounted, a weight longitudinally slidably but non-rotatively accommodated on the rst mentioned end of said screw for reaction against said head, said weight and screw having cooperating means for preventing rotation of the weight on the screw, and handle means on said weight for sliding said Weight along saidv screw and for rotating said weight in said adaptor.

2. A tool for removing an engine head from the engine body comprising a screw having one end portion threaded, a head at the other end of said screw, the portion of the screw between said head and the threaded portion being rectangular in cross section, a weight slidably accommodated upon the squared portion of said screw and having its bore conforming to the cross section thereof' to cause turning of the screw with the Weight, handling means carried by said weight for sliding the weight along the screw and impartingA ANDREW KERZAK. 

